IPS-VIDEO Altera, IPS-VIDEO Datasheet - Page 158

• Manufacturer Part Number: IPS-VIDEO
• Description: MegaCore Suite W/ 17 DSP Video/image Processing Functions
• Manufacturer: Altera
• Type: -r

Specifications of IPS-VIDEO

• Software Application: IP CORE, SUITES
• Supported Families: Arria GX, Cyclone II, HardCopy II, Stratix II
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Rohs Compliant: NA
• Function: Suite of IP Functions for Video and Image Processing
• License: Initial License
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

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Video and Image Processing Suite User Guide
Deinterlacer
1
Error Recovery
The Control Synchronizer MegaCore function processes all packets until an
endofpacket signal is received; the image width, height and interlaced fields of the
control data packets are not compared against the following video data packet. Any
mismatch of the endofpacket signal and the frame size of a video data packet is
propagated unchanged to the next MegaCore function.
While the bob algorithm (with no buffering) is producing an output frame it
alternates between simultaneously receiving a row on the input port and producing a
row of data on the output port, and just producing a row of data on the output port
without reading any data from the input port.
The delay from input to output is just a few clock cycles. While a field is being
discarded, input is read at the maximum rate and no output is generated.
Select the weave algorithm, so that the MegaCore function stalls for longer than the
usual periods between each output row of the image. Stalls of up to 45 clock cycles are
possible due to the time taken for internal processing in between lines.
Select the motion-adaptive algorithm, so that stalls up to 90 clock cycles are possible.
Select double or triple-buffering, so that external memory decouples data input and
output. The MegaCore function writes non-image data packets into memory by
predeclaring transfers of fixed size. The function cannot interrupt memory
transactions immediately when it receives an endofpacket signal.
For each non-image data packet received, the number of words written into memory
always corresponds to the maximum packet size defined in the parameter editor.
Consequently, the Deinterlacer MegaCore function does not handle control packets
efficiently when large user-defined packets are used. This does not apply when
reading non-image packets back from the external memory because the size of each
incoming packet is registered after it has been determined.
When buffering is used with bob deinterlacing and fields are being discarded, they
are discarded at the input rather than being buffered through external RAM and then
discarded. This reduces the external RAM bandwidth requirement of the Deinterlacer
in these modes.
Error Recovery
An error condition occurs if an endofpacket signal is received too early or too late
relative to the field dimensions contained in the last control packet processed. In all its
configurations, the Deinterlacer discards extra data if the endofpacket signal is
received too late.
If an early endofpacket signal is received when the Deinterlacer is configured for no
buffering, the MegaCore function interrupts its processing within one or two lines
sending undefined pixels, before propagating the endofpacket signal.
Chapter 5: Functional Descriptions
Stall Behavior and Error Recovery
May 2011 Altera Corporation